Been driving it, runs great, but a couple of things at startup. When first fired up when cold, it runs rough at a low rpm, and then stalls. So you have to help it out by reving it up a little and then letting it idle. However it idles rough until it is up to operating temp. I just need to know what possible fields to look at that would deal with this.

The thing runs perfect at partial throttle, and runs 128BLMs cruizing.

The other problem is, when you get far into the throttle, whether it is just a quick snap, or slowly, it looses all function and goes into a high idle. It also will not do anything when you give it throttle. It just cuts out until you let off and will die if you do not let off. What the hell causes that? It does not stop until you pull the eprom, and put it back in??? Have not ever tied to let it sit for awhile to see if it goes away.

any help would be great. This thing is a beast, only giving it 1/4 throttle in third gear at 40 blows the tires off!!!!!!!! Just slightly cracking the throttle it explodes with torque. Can't wait to get into it!

 

How about a few clues as to what your working on.
TBI/TPI
what ecm
85/86/89/90
What mask?.
Some of us are on a few different lists and even if you mentioned this before, you need to repeat the basics so we can all synch up on what's going on.

 

Can't believe I forgot that...

TPI, accel runners, TFS 23 heads, dynomax headers, dual cats, 3" exhaust, 383 stroker

-89' 165 ecm and harness
-89' vette manual trans bin apyp
-$6E

 

This syndrome has occured with my 730/ARFP when the chip was not correctly connected to the Memcal, or when I had a failed chip "burn". In these cases, I have assumed that it went into limp home mode, as the SES light was also on. It runs just as you report, and I would not like to have to drive it in that mode!

Perhaps the ECM is seeing something it thinks is fatal when you get into the throttle, and the chip R&R resets the error code--

 

is the ses light on at all? have you pulled any codes out? best to start looking at the simple stuff first before moving on..cheers, Bob

 

does it link . I had a prom fall out(DigiKey ZIF tin& plastic) and the Limp ***** mode took me around town for 20 min till I checked it.